| 摘要 |
<p>1,009,276. Pipe couplings. BRITISH PETROLEUM CO. Ltd. April 28, 1964 [June 5, 1963], No. 22314/63. Heading F2G. A coupling device for pipes or conduits comprises first and second coupling parts provided respectively with first and second valve members, the parts when brought together in use, being adapted to provide a small fluid connection between them, the fluid connection being provided by means of a passage which allows the fluid to flow from the first coupling part into the second coupling part, interengagement of the two coupling parts causing the second valve member 14 to be moved from the closed to the open position thereof the energy therefor being provided by the pressure of the fluid in the first coupling part, the movement of the valve member 14 moving the first valve member from the closed to the open position thereof by direct contact. As shown, interengagement of the coupling parts causes an auxiliary valve 15 and a complementary auxiliary valve on a complementary coupling part to open and fluid flows through a passage 16 in the valve stem 17 to the side 18a of a chamber 18 and then through a passage 22 to the side 18b of the chamber so that the pressures on each side of a piston 20 on the valve stem are substantially equal and the piston is not actuated. Rotation of a knob 26 actuates a device 27 which locks the coupling members together and causes a cam 28 to release the valve stem 17 and to move a spool valve 23 which closes the passage 22 so that fluid flows under pressure and via the passage 16 in to the side 18a of the chamber 18 whereby the piston 20 is moved to open the valve 14. As the valve 14 opens fluid flows to the output end 12 of the coupling part and causes an increase of pressure on a diaphragm 30 which allows, through a spool valve 29, a fluid connection between the side 18a of the chamber 18 and the outlet end 12 via the passages 35, 36. A build-up of pressure above a predetermined maximum causes further movement of the valve 29 to interconnect the two sides 18a, 18b of the chamber 18 via the passages 34, 35 in which condition the fluid pressure on the valve 14 and the pressure of the spring 21 causes the valve to tend to close until the pressure at the outlet end 12 falls to the required value and the valve 29 returns to an intermediate position thereof. During uncoupling the knob 26 is returned to the initial position thereof so that the passage 22 is opened and the valve 14 is closed due to the fluid pressure on the complementary valve and the pressure exerted by the spring.</p> |
